Messages in this thread | | | Subject | Re: [PATCH] locking/qspinlock: Fix build for anonymous union in older gcc compilers | From | Waiman Long <> | Date | Fri, 22 Jun 2018 10:05:08 +0800 |
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On 06/22/2018 08:35 AM, Steven Rostedt wrote: > From: Steven Rostedt (VMware) <rostedt@goodmis.org> > > One of my tests compiles the kernel with gcc 4.5.3, and I hit the > following build error: > > /work/git/linux-trace.git/include/linux/semaphore.h: In function 'sema_init': > /work/git/linux-trace.git/include/linux/semaphore.h:35:17: error: unknown field 'val' specified in initializer > /work/git/linux-trace.git/include/linux/semaphore.h:35:17: warning: missing braces around initializer > /work/git/linux-trace.git/include/linux/semaphore.h:35:17: warning: (near initialization for '(anonymous).raw_lock.<anonymous>.val') > In file included from /work/git/linux-trace.git/include/linux/sched/user.h:7:0, > from /work/git/linux-trace.git/include/linux/cred.h:22, > from /work/git/linux-trace.git/include/linux/seq_file.h:12, > from /work/git/linux-trace.git/include/linux/cgroup.h:18, > from /work/git/linux-trace.git/include/linux/memcontrol.h:22, > from /work/git/linux-trace.git/include/linux/swap.h:9, > from /work/git/linux-trace.git/include/linux/suspend.h:5, > from /work/git/linux-trace.git/arch/x86/kernel/asm-offsets.c:13: > > > I bisected it down to the introduction of the commit that makes > qspinlock have an anonymous union, which makes initializing it special > for older compilers. By adding strategic brackets, it makes the build > happy again. > > Fixes: 625e88be1f41 ("locking/qspinlock: Merge 'struct __qspinlock' into 'struct qspinlock'") > Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> > --- > diff --git a/include/asm-generic/qspinlock_types.h b/include/asm-generic/qspinlock_types.h > index 0763f065b975..d10f1e7d6ba8 100644 > --- a/include/asm-generic/qspinlock_types.h > +++ b/include/asm-generic/qspinlock_types.h > @@ -63,7 +63,7 @@ typedef struct qspinlock { > /* > * Initializier > */ > -#define __ARCH_SPIN_LOCK_UNLOCKED { .val = ATOMIC_INIT(0) } > +#define __ARCH_SPIN_LOCK_UNLOCKED { { .val = ATOMIC_INIT(0) } } > > /* > * Bitfields in the atomic value:
Acked-by: Waiman Long <longman@redhat.com>
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